Data/hora: 15/06/2024 12:57:12

Provedor de dados: 	63	
País: 	Brazil	
Título: 	Chilling privation during dormancy period and carbohydrate mobilization in Japanese pear trees	
Autores: 	Marafon,Anderson Carlos; Citadin,Idemir; Amarante,Luciano do; Herter,Flávio Gilberto; Hawerroth,Fernando José.	
Data: 	2011-08-01	
Ano: 	2011	
Palavras-chave: 	Pyrus pyrifolia; Carbohydrates; Floral bud abortion; Cell wall acid invertase; Sucrose-phosphate synthase.	
Resumo: 	The flower bud abortion is one of the main problems that limit commercial pear (Pyrus pyrifolia) production in the southern region of Brazil. Insufficient chilling during the dormancy period is known as the main factor of this problem. One of the hypotheses to explain this problem is that the starch mobilization and carbohydrate fluxes to the buds are impeded when mild temperatures occurred during winter. This study compared the total soluble sugars (TSS) and reducing sugars (RS) concentrations, the cell wall acid invertase (CWAI - EC 3.2.1.26) and sucrose-phosphate synthase (SPS - EC 2.4.1.14) activities in wood of branches and floral buds of Japanese pear trees cv. Housui, grafted on Pyrus calleryana and submitted to chilling conditions during the dormancy period. Treatments were: (i) natural conditions; (ii) continuous artificial chilling; (iii) alternating temperatures, and (iv) total chilling privation. TSS and RS contents, as well as CWAI and SPS activities in tissues of branches that received insufficient chilling were lower than those that received sufficient chilling during winter. The starch concentration was superior in wood tissues of branches kept under chilling privation. The chilling privation disturbs carbohydrate mobilization in pear trees, reducing the sucrose synthesis capacity in wood tissues (source) and sucrose importation by the floral buds (sink).	
Tipo: 	Info:eu-repo/semantics/article	
Idioma: 	Inglês	
Identificador: 	http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162011000400011	
Editor: 	São Paulo - Escola Superior de Agricultura "Luiz de Queiroz"	
Relação: 	10.1590/S0103-90162011000400011	
Formato: 	text/html	
Fonte: 	Scientia Agricola  v.68 n.4 2011	
Fonte: 	info:eu-repo/semantics/openAccess